JP6569565B2 - Management device, distribution destination registration method, and distribution destination registration program - Google Patents

Description

  The present invention relates to a management apparatus, a delivery destination registration method, and a delivery destination registration program.

  In recent years, for example, gadgets such as head-mounted displays and network cameras, and LTE (Long Term Evolution) high-speed wireless communication have become widespread. There are an increasing number of remote support cases.

  For example, when a supporter provides on-site support to a worker, the on-site video after the occurrence of a trouble is also important, but in order to confirm how the current trouble occurred, An on-site video is also required. Therefore, for example, there is a demand for a method in which an on-site video is recorded from the start of work at the on-site terminal of the on-site worker and the on-site video before the occurrence of the trouble can be confirmed with the support terminal of the supporter as necessary.

JP 2012-60531 A JP 2009-171471 A

  However, when a field image is recorded at a field terminal at the field and the field image is transmitted from the field terminal to the support terminal, remote support becomes difficult if the transmission delay between the field terminal and the support terminal is large.

  Furthermore, when access from a plurality of support terminals to the site terminal is concentrated, the communication bandwidth on the site terminal side becomes insufficient and the waiting time for video reception on the support terminal side increases, making remote support difficult.

  In one aspect, an object of the present invention is to provide a management device, a distribution destination registration method, and a distribution destination registration program that can suppress transmission delay and shortage of communication bandwidth when distributing video of a field terminal to a support terminal.

  In one aspect, the management apparatus manages a system that transmits video from a field terminal to a plurality of support terminals. The management device includes an acquisition unit, a selection unit, a determination unit, and a registration unit. An acquisition part acquires the route information between the said field terminals for every said support terminal. The selection unit selects, for each of the support terminals, a delivery destination candidate node that is commonly used on a route between the support terminal and the site terminal based on the route information for each of the support terminals. The determination unit determines whether the transmission time from the support terminal to the delivery destination candidate node is within a predetermined threshold for each support terminal when the delivery destination candidate node is selected for each support terminal. judge. When the transmission time is within the predetermined threshold, the registration unit registers the candidate delivery destination node as a delivery destination that holds the video from the field terminal.

  As one aspect, it is possible to suppress a transmission delay and a communication bandwidth shortage when distributing the video of the field terminal to the support terminal.

FIG. 1 is an explanatory diagram illustrating an example of a remote support system according to the present embodiment. FIG. 2 is an explanatory diagram illustrating an example of a server. FIG. 3 is an explanatory diagram illustrating an example of the record configuration of the support table. FIG. 4 is an explanatory diagram illustrating an example of a record configuration of the distribution destination table. FIG. 5 is an explanatory diagram showing an example of NW topology information. FIG. 6 is an explanatory diagram illustrating an example of a distribution destination node. FIG. 7 is a flowchart illustrating an example of the processing operation of the CPU in the management server related to the distribution destination registration process. FIG. 8 is an explanatory diagram illustrating an example of a computer that executes a distribution destination registration program.

  Hereinafter, embodiments of a management device, a delivery destination registration method, and a delivery destination registration program disclosed in the present application will be described in detail based on the drawings. The disclosed technology is not limited by the present embodiment. Moreover, you may combine suitably each Example shown below in the range which does not cause contradiction.

  FIG. 1 is an explanatory diagram illustrating an example of a remote support system 1 according to the present embodiment. The remote support system 1 includes a site terminal 2, a support terminal 3, a network (NW) 4 having a plurality of nodes N, and a server 5. The on-site terminal 2 is a terminal such as a head-mounted display or a network camera with a built-in function for capturing a moving image of a worker in a remote place. The support terminal 3 is a wireless terminal or a wired terminal of a supporter such as an expert who supports the work of the worker. The node N is a communication device that relays communication between the site terminal 2 and the support terminal 3. For convenience of explanation, the on-site terminal 2 is A1, the support terminal 3 is B1 and B2, and the node N is N1 to N6.

  The node N has a function of relaying data, and includes a reception unit 11, a transmission unit 12, and a storage unit 13. The receiving unit 11 receives data in the NW 4. The transmission part 12 transmits the data in NW4. The storage unit 13 is an area that stores, for example, video data captured by the site terminal A1 as received data. It is assumed that only the distribution destination node N, which will be described later, stores the video data of the on-site terminal A1 in the storage unit 13.

  FIG. 2 is an explanatory diagram illustrating an example of the server 5. The server 5 includes a communication unit 21, a ROM (Read Only Memory) 22, a RAM (Random Access Memory) 23, an HDD (Hard Disk Drive) 24, and a CPU (Central Processing Unit) 25. The communication unit 21 is an interface that manages communication with each node N in the NW 4. The ROM 22 is an area for storing various programs. The RAM 23 is a work area in which the CPU 25 reads various programs from the ROM 22 and executes processes using the read programs as processing functions. The HDD 24 is an area for storing the support table 41 and the distribution destination table 42.

  FIG. 3 is an explanatory diagram illustrating an example of a record configuration of the support table 41. The support table 41 shown in FIG. 3 is an area for storing the worker ID 41A, the supporter ID 41B, and the support content 41C in association with each other. The worker ID 41A is an ID for identifying the worker. The supporter ID 41B is an ID for identifying a supporter. The support content 41C is the support content of the supporter. The CPU 25 refers to the support table 41 at the start of on-site work and recognizes the supporter ID 41B corresponding to the worker ID 41A and the support content 41C of the supporter, as well as the worker ID 41A and the supporter from the support content 41C. ID41B can be recognized. For example, referring to the support table 41, the CPU 25 can recognize that the support content 41C of the worker ID 41A “A1” and the supporter ID 41B “B1” is “wiring”.

  FIG. 4 is an explanatory diagram showing an example of the record configuration of the distribution destination table 42. The delivery destination table 42 shown in FIG. 4 is an area for storing the worker ID 42A, the supporter ID 42B, and the delivery destination ID 42C in association with each other. The worker ID 42A is an ID for identifying the worker. The supporter ID 42B is an ID for identifying a supporter. The distribution destination ID 42 </ b> C is an ID for identifying the distribution destination node N that stores the video captured by the worker's site terminal 2. The CPU 25 can identify the delivery destination ID 42C corresponding to the worker ID 42A and the supporter ID 42B with reference to the delivery destination table 42. The CPU 25 can recognize “N5” as the distribution destination ID 42C corresponding to “A1” of the worker ID 42A and “B2” of the supporter ID 42B.

  The CPU 25 includes an acquisition unit 31, a selection unit 32, a determination unit 33, a registration unit 34, and a reception unit 35. The acquisition unit 31 acquires, from the NW 4, NW topology information between the support terminal 3 and the site terminal 2. The acquisition unit 31 acquires NW topology information using, for example, a Ping / Traceroute tool or the like. FIG. 5 is an explanatory diagram showing an example of NW topology information. The NW topology information illustrated in FIG. 5 exemplifies NW topology information between the field terminal A1 and the support terminal B1 and NW topology information between the field terminal A1 and the support terminal B2.

  The NW topology information between the on-site terminal A1 and the support terminal B1 is, for example, information indicating the path of the on-site terminal A1, the node N1, the node N2, the node N3, the node N4, and the support terminal B1. The NW topology information between the on-site terminal A1 and the support terminal B2 is, for example, information indicating the path of the on-site terminal A1, the node N1, the node N2, the node N5, the node N6, and the support terminal B2.

  The selection unit 32 selects a delivery destination candidate to be used in common among the support terminals 3 based on the NW topology information for each support terminal 3 corresponding to the site terminal 2. For example, the selection unit 32 refers to the NW topology information of the support terminals B1 and B2 corresponding to the on-site terminal A1, and distributes the final common node N2 among the common nodes N1 and N2 that are commonly used in the NW topology information. Identifies as the first candidate. The final common node N is a node N having the smallest number of hops to the support terminals B1 and B2 among the plurality of common nodes N1 and N2, as shown in FIG.

  The determination unit 33 determines for each support terminal 3 whether or not the transmission time from the support terminal 3 to the distribution destination candidate exceeds a predetermined threshold. The predetermined threshold is, for example, a transmission time during which video can be stably transmitted under normal load conditions. When the node N2 is specified as the distribution destination candidate in the NW topology information illustrated in FIG. 5, the determination unit 33 calculates the transmission time T1 from the node N2 to the support terminal B1. The determination unit 33 determines whether or not the transmission time T1 is within a predetermined threshold. When the transmission time T1 is within the predetermined threshold, the selection unit 32 determines the distribution destination candidate node N2 for “B1” of the support terminal 3 as the distribution destination. When the selection unit 32 determines the distribution destination node N2 of the support terminal 3, the registration unit 34 sets the distribution destination node N2 as the distribution destination ID 42C and the worker ID 42A “A1” of the site terminal 2 and the support terminal 3 The information is registered in the delivery destination table 42 in association with the supporter ID 42B “B1”. Further, the determination unit 33 calculates a transmission time T2 from the distribution destination candidate node N2 to the support terminal B2. The determination unit 33 determines whether or not the transmission time T2 is within a predetermined threshold.

  When the transmission time T2 is not within the predetermined threshold value, the selection unit 32 selects the node N5 in which the number of hops from the distribution destination candidate node N2 to the support terminal 3 of “B2” is decreased by one as the distribution destination candidate. Then, the determination unit 33 measures the transmission time T3 from the delivery destination candidate node N5 after the hop count change to the support terminal 3 of “B2”, and again determines whether the measured transmission time T3 exceeds a predetermined threshold value. judge. That is, the selection unit 32 repeatedly selects, as a delivery destination candidate, the node N in which the number of hops from the delivery destination candidate to the support terminal 3 is decreased by one unit until the transmission time is within a predetermined threshold. FIG. 6 is an explanatory diagram showing an example of the distribution destination node N. The distribution destination node N of the support terminal 3 of “B1” in FIG. 6 is the node N2. Furthermore, the distribution destination node N of the support terminal 3 of “B2” is the node N5.

  When the delivery destination node N for each support terminal 3 of the site terminal 2 is registered in the delivery destination table 42, the registration unit 34 stores the site terminal 2 and the delivery so as to store the video of the site terminal 3 in the delivery destination node N. Instruct the destination node N. As shown in FIG. 6, the registration unit 34 instructs the on-site terminal 2 at “A1” to transmit video to the delivery destination node N2 of the support terminal 3 at “B1”, and also sends it to the delivery destination node N2. Instruct to store the video of the on-site terminal 2 of “A1”. Further, the registration unit 34 instructs the node N2 to transmit the video of the on-site terminal 2 of “A1” to the delivery destination node N5 of the support terminal 3 of “B2” and also sends “ Instruct to store the video of the on-site terminal 2 of A1 ″

  When receiving the video delivery request of the designated worker from the support terminal 3, the reception unit 35 specifies the delivery destination according to the video delivery request, and delivers the video from the delivery destination node N to the support terminal 3. The distribution destination node N is instructed as follows. The video delivery request includes the supporter ID of the requesting support terminal 3 and the worker ID of the requested video delivery source. The accepting unit 35 specifies a delivery destination ID 42C corresponding to the worker ID 42A and the supporter ID 42B in the received video delivery request from the delivery destination table 42. Then, the accepting unit 35 instructs the identified delivery destination node N to deliver video to the support terminal 3.

  Next, the operation of the remote support system 1 of this embodiment will be described. FIG. 7 is a flowchart showing an example of the processing operation of the CPU 25 in the server 5 related to the delivery destination setting process.

  In FIG. 7, the acquisition unit 31 in the CPU 25 designates a supporter ID for each worker ID from the support table 41 (step S11). The acquisition unit 31 acquires NW topology information up to the designated support terminal 3 from the NW 4 (step S12). The acquisition unit 31 determines whether there is an unspecified supporter ID corresponding to the worker ID (step S13). If there is an unspecified supporter ID corresponding to the worker ID (Yes at Step S13), the acquisition unit 31 proceeds to Step S11 to specify an unspecified supporter ID.

  When there is no unspecified supporter ID corresponding to the worker ID (No at Step S13), the selection unit 32 in the CPU 25 refers to the NW topology information up to each support terminal 3 for each worker ID. And the selection part 32 specifies the last common node as a delivery destination candidate from these NW topology information for every assistance terminal 3 (step S14). In the case of the NW topology information shown in FIG. 5, the selection unit 32 specifies the last common node, that is, the node N2 among the nodes N1 and N2 as a delivery destination candidate.

  The registration unit 34 in the CPU 25 registers the final common node as a delivery destination candidate in the delivery destination corresponding to the supporter ID of the worker ID (step S15). The determination unit 33 in the CPU 25 designates the supporter ID 42B corresponding to the worker ID 42A from the distribution destination table 42 (step S16). The determination unit 33 selects a delivery destination candidate of the delivery destination ID 42C corresponding to the designated worker ID 42A and supporter ID 42B (step S17), and measures the transmission time from the delivery destination candidate to the support terminal 3 (step S18). .

  The determination unit 33 determines whether or not the measured transmission time is within a predetermined threshold (step S19). If the delay time is not within the predetermined threshold (No at Step S19), the selection unit 32 selects a node whose number of hops from the current distribution destination candidate to the support terminal 3 is reduced by one hop as a distribution destination candidate (Step S20). And the selection part 32 transfers to step S18 in order to measure the transmission time from the selected delivery destination candidate to the support terminal 3. FIG.

  When the transmission time is within the predetermined threshold (Yes at Step S19), the registration unit 34 in the CPU 25 determines whether the distribution destination candidate is a common node (Step S21). When the delivery destination candidate is a common node (Yes at Step S21), the registration unit 34 registers the delivery destination candidate in the delivery destination ID 42C corresponding to the worker ID 42A and the supporter ID 42B (Step S22). Then, after registering the delivery destination candidate, the registration unit 34 determines whether there is an unspecified supporter ID 42B corresponding to the worker ID 42A (step S23).

  When there is an unspecified supporter ID 42B corresponding to the worker ID 42A (Yes at Step S23), the registration unit 34 proceeds to Step S16 to specify the unspecified supporter ID 42B. If there is no unspecified supporter ID 42B corresponding to the worker ID 42A (No at Step S23), the registration unit 34 ends the processing operation illustrated in FIG.

  When the distribution destination candidate is not a common node (No at Step S21), the registration unit 34 sets transfer to the common node so as to transfer the video from the final common node to the distribution destination candidate (Step S24). In the example of FIG. 6, the transfer setting is information for transferring the video of the on-site terminal 2 from the final common node N2 to the distribution destination node N5. The registration unit 34 transfers to and sets in step S24, and then proceeds to step S22 to register the delivery destination candidate in the delivery destination ID 42C corresponding to the worker ID 42A and the supporter ID 42B. That is, the registration unit 34 registers the worker A1 as the worker ID 42A, the supporter B2 as the supporter ID 42B, and the node N5 as the distribution destination ID 42C.

  The CPU 25 that executes the delivery destination setting process acquires NW topology information with the site terminal 2 for each support terminal 3. Based on the NW topology information for each support terminal 3, the CPU 25 selects a distribution destination candidate common node N to be used in common among the support terminals 3. Further, when the transmission time from the support terminal 3 to the distribution destination candidate node N is within a predetermined threshold for each support terminal 3, the CPU 25 holds the distribution destination candidate node N and the video from the field terminal 2. Register as a delivery destination. As a result, the server 5 identifies a delivery destination for delivering the video for each worker ID and supporter ID. Furthermore, it is possible to suppress a transmission delay and a communication band shortage when distributing the video of the field terminal 2 to the support terminal 3.

  When the transmission time from the support terminal 3 to the distribution destination candidate node N is not within a predetermined threshold, the CPU 25 determines the next candidate distribution destination candidate in which the number of hops from the distribution destination candidate node N to the support terminal 3 is reduced by one. Is selected. Then, the CPU 25 repeatedly selects a delivery destination candidate whose number of hops is reduced by one until the transmission time from the support terminal 3 to the delivery destination candidate node N is within a predetermined threshold. Then, when the transmission time of the selected delivery destination candidate falls within a predetermined threshold, the CPU 25 registers the delivery destination candidate as a delivery destination. As a result, it is possible to suppress the transmission delay between the video support terminals 3 related to the same worker.

  The server 5 according to the present embodiment acquires NW topology information with the on-site terminal 2 for each support terminal 3. Based on the NW topology information for each support terminal 3, the server 5 selects a distribution destination candidate node N to be used in common among the support terminals 3. Further, when the transmission time from the support terminal 3 to the delivery destination candidate node N is within a predetermined threshold for each support terminal 3, the server 5 displays the delivery destination candidate node N as an image from the field terminal 2. Register as a destination to hold. That is, an appropriate delivery destination node N is selected for each support terminal 3 from a plurality of nodes N existing between the work site terminal 2 and the support terminal 3, and the selected delivery destination node N is assigned to the site terminal 2. Memorize the video in advance. As a result, it is possible to suppress transmission delay and communication bandwidth shortage when distributing the video of the field terminal 2 to the support terminal 3. And the smooth remote assistance to the worker by a supporter is realizable.

  Furthermore, the server 5 only needs to transmit the field image from the field terminal 2 at the field even to the field work that requires a plurality of supporters, thereby congesting the communication band. Disappear. Further, since the video is distributed to the support terminal 3 where a comfortable response is ensured for each support terminal 3, the past site work video can be confirmed smoothly.

  If the transmission time to the distribution destination candidate node N is not within a predetermined threshold, the server 5 selects the next candidate distribution destination candidate in which the number of hops from the distribution destination candidate node N to the support terminal 3 is reduced by one. As a result, it is possible to suppress the transmission delay between the video support terminals 3 related to the same worker.

  When the transmission time from the distribution destination candidate to the support terminal 3 is within a predetermined threshold, the selection unit 32 determines the distribution destination candidate as the distribution destination. However, when the distribution destination node N does not have the video distribution function, the node N is not suitable as the distribution destination. Therefore, the selection unit 32 determines whether or not the distribution destination candidate has a video distribution function, and when the distribution destination candidate has the video distribution function and the transmission time of the distribution destination candidate is within a predetermined threshold. The distribution destination candidates may be registered as distribution destinations. Further, when the distribution destination candidate does not have the video distribution function, the selection unit 32 selects the next candidate distribution destination candidate so that the number of hops from the distribution destination candidate node N to the support terminal 3 is increased by one. You may do it. For example, if the next delivery destination candidate shown in FIG. 6 is the node N3, the next candidate delivery destination candidate has one more hop from the delivery destination candidate node N3 to the support terminal 3 of “B1”. Node N, that is, node N2. As a result, it is possible to prevent selection of a node N that is not suitable as a distribution destination according to the presence or absence of the video distribution function.

  It is determined whether or not the storage unit 13 of the distribution destination candidate node N has a storage capacity capable of storing the video of the field terminal 2, the distribution destination candidate node N has the storage capacity, and the distribution destination If the candidate transmission time is within a predetermined threshold, the delivery destination candidate may be registered as a delivery destination. In addition, when the node N that is the distribution destination candidate does not have the storage capacity, the selection unit 32 increases the number of hops from the node N that is the distribution destination candidate to the support terminal 3 by one to increase the next candidate distribution destination candidate. May be selected. For example, if the next delivery destination candidate shown in FIG. 6 is the node N3, the next candidate delivery destination candidate has one more hop from the delivery destination candidate node N3 to the support terminal 3 of “B1”. Node N, that is, node N2. As a result, node selection that is not suitable as a distribution destination can be prevented according to the video capacity of the field terminal 2.

  In addition, the determination unit 33 determines whether or not the transmission time from the distribution destination candidate to the support terminal 3 is within a predetermined threshold, and when the transmission time is within the predetermined threshold, the distribution destination candidate node N is set as the distribution destination. Were determined. However, when the access frequency of the support terminal 3 with respect to the field terminal 2 is higher than the predetermined reference value, the access frequency is high. Therefore, the predetermined threshold for determining the transmission time may be set small. For example, when the support terminal 3 that frequently checks the video accesses frequently, the predetermined threshold is set short. In addition, when the access is not frequently performed, the predetermined threshold is set long.

  The determination unit 33 calculates the transmission time from the distribution destination candidate node N to the support terminal 3 for each support terminal 3, and determines whether the transmission time is within a predetermined threshold. However, the determination unit 33 calculates a delay time based on a difference in transmission time from the distribution destination candidate node N to the support terminal 3 based on the NW topology information of each support terminal 3 for each site terminal 2, and the delay time is calculated. You may make it determine whether it is less than a reference | standard threshold value. For example, the determination unit 33 calculates a transmission time T1 from the node N2 to the support terminal B1 and a transmission time T2 from the node N2 to the support terminal B2. The determination unit 33 determines whether or not a delay time that is a difference between the transmission times T1 and T2 is within a reference threshold value.

  The accepting unit 35 identifies the distribution destination node N corresponding to the worker ID 42A and the supporter ID 42B in response to the video distribution request from the support terminal 3, and the video to the support terminal 3 for the identified distribution destination node N. Instructed delivery. However, the receiving unit 35 notifies the address of the identified distribution destination node N to the support terminal 3 that has requested the video distribution request, and the support terminal 3 transmits the video to the distribution destination node N based on the notified address. You may make it request | require delivery.

  The remote support system 1 is in the form of a client server. For example, various functions such as an acquisition unit 31, a selection unit 32, a determination unit 33, and a registration unit 34 are built in the server 5. In this case, the server 5 is unnecessary.

  In the remote support system 1, devices such as the field terminal 2, the support terminal 3, and the server 5 can be connected to each other via the NW 4. However, instead of the NW 4, for example, the Internet or a LAN (Local Area Network) may be used and can be changed as appropriate.

  In the above embodiment, the server 5 is a computer, but various functions and information of the server 5 may be realized by cloud computing.

  In addition, each component of each part illustrated does not necessarily need to be physically configured as illustrated. In other words, the specific form of distribution / integration of each part is not limited to the one shown in the figure, and all or a part thereof may be functionally or physically distributed / integrated in arbitrary units according to various loads and usage conditions. Can be configured. For example, the acquisition unit 31, the selection unit 32, the determination unit 33, the registration unit 34, and the reception unit 35 may be connected as an external device of the server 4 via the NW 4. In addition, even if the acquisition unit 31, the selection unit 32, the determination unit 33, the registration unit 34, and the reception unit 35 have different devices and are connected by the NW 4 to cooperate, the function of the server 5 can be realized. good.

  Furthermore, the various processing functions performed in the server 5 are all or some arbitrary on a CPU (Central Processing Unit) (or a microcomputer such as an MPU (Micro Processing Unit) or MCU (Micro Controller Unit)). You may make it perform. Various processing functions may be executed entirely or arbitrarily on a program that is analyzed and executed by a CPU (or a microcomputer such as an MPU or MCU) or hardware based on wired logic. Needless to say.

  By the way, the various processes described in the present embodiment can be realized by executing a prepared program on a computer. Therefore, in the following, an example of a computer that executes a program having the same function as the above embodiment will be described. FIG. 8 is an explanatory diagram illustrating an example of a computer 100 that executes a distribution destination registration program.

  In FIG. 8, the computer 100 that executes the distribution destination registration program includes a communication unit 110, a ROM 120, a RAM 130, a CPU 140, and a bus 150. The computer 100 manages a transmission system that transmits video from a field terminal to a plurality of support terminals.

  The ROM 120 stores in advance a distribution destination registration program that exhibits the same function as in the above embodiment. Note that the processing program may be recorded on a recording medium readable by a drive (not shown) instead of the ROM 120. Further, as the recording medium, for example, a portable recording medium such as a CD-ROM, a DVD disk, a USB memory, an SD card, or a semiconductor memory such as a flash memory may be used. The processing programs are an acquisition program 120A, a selection program 120B, a determination program 120C, and a registration program 120D. Note that the acquisition program 120A, the selection program 120B, the determination program 120C, and the registration program 120D may be appropriately integrated or distributed. The computer 100 may acquire and execute the distribution destination registration program from these portable physical media. Further, the distribution destination registration program is stored in another computer or the like connected to the computer 100 via a public line, the Internet, a LAN, a WAN, or the like, and the computer 100 acquires and executes the distribution destination registration program therefrom. You may do it.

  Then, the CPU 140 reads the acquisition program 120A, the selection program 120B, the determination program 120C, and the registration program 120D from the ROM 120, and develops each read program on the RAM 130. The CPU 140 causes the acquisition program 120A, the selection program 120B, the determination program 120C, and the registration program 120D to function as the acquisition process 130A, the selection process 130B, the determination process 130C, and the registration process 130D on the RAM 130. Note that in the CPU 140, not all the processing units shown in the present embodiment need to operate, and it is only necessary that a processing unit corresponding to a process to be executed is virtually realized.

  CPU140 acquires the route information between field terminals for every support terminal. Based on the route information for each support terminal, the CPU 140 selects a delivery destination candidate node to be used in common on the route between the support terminal and the site terminal for each support terminal. When selecting a delivery destination candidate node for each support terminal, the CPU 140 determines, for each support terminal, whether or not the transmission time from the support terminal to the delivery destination candidate node is within a predetermined threshold. When the transmission time is within a predetermined threshold, the CPU 140 registers the distribution destination candidate node as a distribution destination that holds a video from the field terminal. As a result, it is possible to suppress a transmission delay and a communication band shortage when distributing the video of the field terminal to the support terminal.

DESCRIPTION OF SYMBOLS 1 Remote assistance system 2 Field terminal 3 Support terminal 5 Server 31 Acquisition part 32 Selection part 33 Judgment part 34 Registration part N node

Claims (7)

A management device for managing a system for transmitting video from a field terminal to a plurality of support terminals,
An acquisition unit that acquires path topology information between the on-site terminal for each support terminal;
For each support terminal, a common node having the smallest number of hops to the support terminal among the common nodes commonly used in the path topology information from the path topology information for each support terminal is set as a delivery destination candidate node for each support terminal. A selection section to select;
A determination unit that determines whether a transmission time from the support terminal to the delivery destination candidate node is within a predetermined threshold for each support terminal when the delivery destination candidate node is selected for each support terminal. When,
A management apparatus comprising: a registration unit that registers a node of the delivery destination candidate as a delivery destination that holds a video from the field terminal when the transmission time is within the predetermined threshold. The selection unit is
When the transmission time from the support terminal to the delivery destination candidate node is not within the predetermined threshold, the next candidate delivery destination candidate is set so that the number of hops from the delivery destination candidate node to the support terminal is reduced. The management apparatus according to claim 1, wherein a node is selected. The selection unit is
When the delivery destination candidate node is selected for each support terminal, it is determined whether or not the delivery destination candidate node has a video delivery function, and the delivery destination candidate node has the video delivery function. 3. The management apparatus according to claim 2, wherein the next candidate distribution destination candidate node is selected so that the number of hops from the distribution destination candidate node to the support terminal increases when the distribution destination candidate node does not exist. The selection unit is
When the delivery destination candidate node is selected for each of the support terminals, it is determined whether or not the delivery destination candidate node has a storage capacity capable of storing the video of the site terminal. 3. The next candidate delivery destination node is selected so that the number of hops from the delivery destination candidate node to the support terminal increases when the node does not have the storage capacity. The management device described. The determination unit
The management apparatus according to claim 1, wherein the predetermined threshold value is adjusted for each support terminal according to an access frequency to the field terminal. A management device distribution destination registration method for managing a system for transmitting video from a field terminal to a plurality of support terminals,
The management device is
Obtain route topology information with the field terminal for each support terminal,
From acquired the route topology information of the support each terminal, among the common nodes used in common in the route topology information, said support common node hop number smallest to the support terminal as a node of the destination candidates Select for each terminal ,
It is determined whether or not the transmission time to the delivery destination candidate node is within a predetermined threshold for each of the support terminals,
When the transmission time is within the predetermined threshold, a distribution destination registration method is executed, wherein the distribution destination candidate node is registered as a distribution destination that holds video from the field terminal. To a computer that manages a system that transmits video from a field terminal to multiple support terminals,
Obtain route topology information with the field terminal for each support terminal,
From the acquired path topology information for each of the support terminals , among the common nodes that are commonly used in the path topology information, the common node having the smallest number of hops to the support terminal is used as the distribution destination candidate node. Select for each terminal ,
When the delivery destination candidate node is selected for each support terminal, it is determined whether the transmission time from the support terminal to the delivery destination candidate node is within a predetermined threshold for each support terminal;
When the transmission time is within the predetermined threshold value, a distribution destination registration program for executing a process of registering the distribution destination candidate node as a distribution destination that holds a video from the field terminal.

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